326 



MY HI A POD A. 



to me to have much weight, so that the homology of the appendages in 

 question with the second pair of maxillfe may be provisionally assumed. 



The third pair of post-oral appendages of the Chilopoda may probably also 

 be assumed to be equivalent to the second pair of maxillse, though they are 

 limb-like and not connected with the head. The subjoined table shews 

 the probable homologies of the appendages. 



The germinal layers and formation of organs. 



The development of the organs of the Myriapoda, and the origin of the 

 germinal layers, are very imperfectly known : Myriapoda appear however 

 to be closely similar to Insects in this part of their development, and the 

 general question of the layers will be treated more fully in connection with 

 that group. 



The greater part of the blastoderm gives rise to the epiblast, which 

 furnishes the skin, nervous system, tracheal system, and the stomodamm 

 and proctodseum. 



The mesoblast arises in connection with the ventral thickening of the 

 blastoderm, but the details of its formation are not known. Metschnikoff 

 describes a longitudinal furrow which appears very early in Strongylosoma, 



